A hexahistidine-Zn super(2+)-dye label reveals STIM1 surface exposure
Site-specific fluorescent labeling of proteins in vivo remains one of the most powerful techniques for imaging complex processes in live cells. Although fluorescent proteins in many colors are useful tools for tracking expression and localization of fusion proteins in cells, these relatively large t...
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Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2007-03, Vol.104 (10), p.3693-3697 |
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description | Site-specific fluorescent labeling of proteins in vivo remains one of the most powerful techniques for imaging complex processes in live cells. Although fluorescent proteins in many colors are useful tools for tracking expression and localization of fusion proteins in cells, these relatively large tags (>220 aa) can perturb protein folding, trafficking and function. Much smaller genetically encodable domains ( |
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Although fluorescent proteins in many colors are useful tools for tracking expression and localization of fusion proteins in cells, these relatively large tags (>220 aa) can perturb protein folding, trafficking and function. Much smaller genetically encodable domains (<15 aa) offer complementary advantages. We introduce a small fluorescent chelator whose membrane-impermeant complex with nontoxic Zn super(2+) ions binds tightly but reversibly to hexahistidine (His sub(6)) motifs on surface-exposed proteins. This live-cell label helps to resolve a current controversy concerning externalization of the stromal interaction molecule STIM1 upon depletion of Ca super(2+) from the endoplasmic reticulum. Whereas N-terminal fluorescent protein fusions interfere with surface exposure of STIM1, short His sub(6) tags are accessible to the dye or antibodies, demonstrating externalization.</description><identifier>ISSN: 0027-8424</identifier><identifier>EISSN: 1091-6490</identifier><language>eng</language><ispartof>Proceedings of the National Academy of Sciences - PNAS, 2007-03, Vol.104 (10), p.3693-3697</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780</link.rule.ids></links><search><creatorcontrib>Hauser, Christina T</creatorcontrib><creatorcontrib>Tsien, Roger Y</creatorcontrib><title>A hexahistidine-Zn super(2+)-dye label reveals STIM1 surface exposure</title><title>Proceedings of the National Academy of Sciences - PNAS</title><description>Site-specific fluorescent labeling of proteins in vivo remains one of the most powerful techniques for imaging complex processes in live cells. Although fluorescent proteins in many colors are useful tools for tracking expression and localization of fusion proteins in cells, these relatively large tags (>220 aa) can perturb protein folding, trafficking and function. Much smaller genetically encodable domains (<15 aa) offer complementary advantages. We introduce a small fluorescent chelator whose membrane-impermeant complex with nontoxic Zn super(2+) ions binds tightly but reversibly to hexahistidine (His sub(6)) motifs on surface-exposed proteins. This live-cell label helps to resolve a current controversy concerning externalization of the stromal interaction molecule STIM1 upon depletion of Ca super(2+) from the endoplasmic reticulum. 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Although fluorescent proteins in many colors are useful tools for tracking expression and localization of fusion proteins in cells, these relatively large tags (>220 aa) can perturb protein folding, trafficking and function. Much smaller genetically encodable domains (<15 aa) offer complementary advantages. We introduce a small fluorescent chelator whose membrane-impermeant complex with nontoxic Zn super(2+) ions binds tightly but reversibly to hexahistidine (His sub(6)) motifs on surface-exposed proteins. This live-cell label helps to resolve a current controversy concerning externalization of the stromal interaction molecule STIM1 upon depletion of Ca super(2+) from the endoplasmic reticulum. Whereas N-terminal fluorescent protein fusions interfere with surface exposure of STIM1, short His sub(6) tags are accessible to the dye or antibodies, demonstrating externalization.</abstract></addata></record> |
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title | A hexahistidine-Zn super(2+)-dye label reveals STIM1 surface exposure |
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